2 * Copyright (C) 2011-2014 Felix Fietkau <nbd@openwrt.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License version 2.1
6 * as published by the Free Software Foundation
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <sys/socket.h>
18 #include <sys/param.h>
26 #include <libubox/blob.h>
27 #include <libubox/uloop.h>
28 #include <libubox/usock.h>
29 #include <libubox/list.h>
33 #define USES_EXTERNAL_BUFFER ~0U
35 static struct ubus_msg_buf *ubus_msg_ref(struct ubus_msg_buf *ub)
37 struct ubus_msg_buf *new_ub;
38 if (ub->refcount == USES_EXTERNAL_BUFFER) {
39 new_ub = ubus_msg_new(ub->data, ub->len, false);
42 memcpy(&new_ub->hdr, &ub->hdr, sizeof(struct ubus_msghdr));
51 struct ubus_msg_buf *ubus_msg_new(void *data, int len, bool shared)
53 struct ubus_msg_buf *ub;
54 int buflen = sizeof(*ub);
59 ub = calloc(1, buflen);
66 ub->refcount = USES_EXTERNAL_BUFFER;
70 ub->data = (void *) (ub + 1);
72 memcpy(ub + 1, data, len);
79 void ubus_msg_free(struct ubus_msg_buf *ub)
81 switch (ub->refcount) {
83 case USES_EXTERNAL_BUFFER:
95 static ssize_t ubus_msg_writev(int fd, struct ubus_msg_buf *ub, size_t offset)
97 static struct iovec iov[2];
103 .cmsg_len = sizeof(fd_buf),
104 .cmsg_level = SOL_SOCKET,
105 .cmsg_type = SCM_RIGHTS,
108 struct msghdr msghdr = {
110 .msg_iovlen = ARRAY_SIZE(iov),
111 .msg_control = &fd_buf,
112 .msg_controllen = sizeof(fd_buf),
114 struct ubus_msghdr hdr;
118 if (ub->fd < 0 || offset) {
119 msghdr.msg_control = NULL;
120 msghdr.msg_controllen = 0;
123 if (offset < sizeof(ub->hdr)) {
124 hdr.version = ub->hdr.version;
125 hdr.type = ub->hdr.type;
126 hdr.seq = cpu_to_be16(ub->hdr.seq);
127 hdr.peer = cpu_to_be32(ub->hdr.peer);
129 iov[0].iov_base = ((char *) &hdr) + offset;
130 iov[0].iov_len = sizeof(hdr) - offset;
131 iov[1].iov_base = (char *) ub->data;
132 iov[1].iov_len = ub->len;
134 offset -= sizeof(ub->hdr);
135 iov[0].iov_base = ((char *) ub->data) + offset;
136 iov[0].iov_len = ub->len - offset;
137 msghdr.msg_iovlen = 1;
141 ret = sendmsg(fd, &msghdr, 0);
142 } while (ret < 0 && errno == EINTR);
147 static void ubus_msg_enqueue(struct ubus_client *cl, struct ubus_msg_buf *ub)
149 if (cl->tx_queue[cl->txq_tail])
152 cl->tx_queue[cl->txq_tail] = ubus_msg_ref(ub);
153 cl->txq_tail = (cl->txq_tail + 1) % ARRAY_SIZE(cl->tx_queue);
156 /* takes the msgbuf reference */
157 void ubus_msg_send(struct ubus_client *cl, struct ubus_msg_buf *ub)
161 if (ub->hdr.type != UBUS_MSG_MONITOR)
162 ubusd_monitor_message(cl, ub, true);
164 if (!cl->tx_queue[cl->txq_cur]) {
165 written = ubus_msg_writev(cl->sock.fd, ub, 0);
170 if (written >= (ssize_t) (ub->len + sizeof(ub->hdr)))
173 cl->txq_ofs = written;
175 /* get an event once we can write to the socket again */
176 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_WRITE | ULOOP_EDGE_TRIGGER);
178 ubus_msg_enqueue(cl, ub);
181 static struct ubus_msg_buf *ubus_msg_head(struct ubus_client *cl)
183 return cl->tx_queue[cl->txq_cur];
186 static void ubus_msg_dequeue(struct ubus_client *cl)
188 struct ubus_msg_buf *ub = ubus_msg_head(cl);
195 cl->tx_queue[cl->txq_cur] = NULL;
196 cl->txq_cur = (cl->txq_cur + 1) % ARRAY_SIZE(cl->tx_queue);
199 static void handle_client_disconnect(struct ubus_client *cl)
201 while (ubus_msg_head(cl))
202 ubus_msg_dequeue(cl);
204 ubusd_monitor_disconnect(cl);
205 ubusd_proto_free_client(cl);
206 if (cl->pending_msg_fd >= 0)
207 close(cl->pending_msg_fd);
208 uloop_fd_delete(&cl->sock);
213 static void client_cb(struct uloop_fd *sock, unsigned int events)
215 struct ubus_client *cl = container_of(sock, struct ubus_client, sock);
216 struct ubus_msg_buf *ub;
217 static struct iovec iov;
223 .cmsg_type = SCM_RIGHTS,
224 .cmsg_level = SOL_SOCKET,
225 .cmsg_len = sizeof(fd_buf),
228 struct msghdr msghdr = {
233 /* first try to tx more pending data */
234 while ((ub = ubus_msg_head(cl))) {
237 written = ubus_msg_writev(sock->fd, ub, cl->txq_ofs);
249 cl->txq_ofs += written;
250 if (cl->txq_ofs < ub->len + sizeof(ub->hdr))
253 ubus_msg_dequeue(cl);
256 /* prevent further ULOOP_WRITE events if we don't have data
258 if (!ubus_msg_head(cl) && (events & ULOOP_WRITE))
259 uloop_fd_add(sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
262 if (!sock->eof && cl->pending_msg_offset < (int) sizeof(cl->hdrbuf)) {
263 int offset = cl->pending_msg_offset;
268 iov.iov_base = ((char *) &cl->hdrbuf) + offset;
269 iov.iov_len = sizeof(cl->hdrbuf) - offset;
271 if (cl->pending_msg_fd < 0) {
272 msghdr.msg_control = &fd_buf;
273 msghdr.msg_controllen = sizeof(fd_buf);
275 msghdr.msg_control = NULL;
276 msghdr.msg_controllen = 0;
279 bytes = recvmsg(sock->fd, &msghdr, 0);
284 cl->pending_msg_fd = fd_buf.fd;
286 cl->pending_msg_offset += bytes;
287 if (cl->pending_msg_offset < (int) sizeof(cl->hdrbuf))
290 if (blob_pad_len(&cl->hdrbuf.data) > UBUS_MAX_MSGLEN)
293 cl->pending_msg = ubus_msg_new(NULL, blob_raw_len(&cl->hdrbuf.data), false);
294 if (!cl->pending_msg)
297 cl->hdrbuf.hdr.seq = be16_to_cpu(cl->hdrbuf.hdr.seq);
298 cl->hdrbuf.hdr.peer = be32_to_cpu(cl->hdrbuf.hdr.peer);
300 memcpy(&cl->pending_msg->hdr, &cl->hdrbuf.hdr, sizeof(cl->hdrbuf.hdr));
301 memcpy(cl->pending_msg->data, &cl->hdrbuf.data, sizeof(cl->hdrbuf.data));
304 ub = cl->pending_msg;
306 int offset = cl->pending_msg_offset - sizeof(ub->hdr);
307 int len = blob_raw_len(ub->data) - offset;
311 bytes = read(sock->fd, (char *) ub->data + offset, len);
317 cl->pending_msg_offset += bytes;
322 ub->fd = cl->pending_msg_fd;
323 cl->pending_msg_fd = -1;
324 cl->pending_msg_offset = 0;
325 cl->pending_msg = NULL;
326 ubusd_monitor_message(cl, ub, false);
327 ubusd_proto_receive_message(cl, ub);
332 if (!sock->eof || ubus_msg_head(cl))
336 handle_client_disconnect(cl);
339 static bool get_next_connection(int fd)
341 struct ubus_client *cl;
344 client_fd = accept(fd, NULL, 0);
355 cl = ubusd_proto_new_client(client_fd, client_cb);
357 uloop_fd_add(&cl->sock, ULOOP_READ | ULOOP_EDGE_TRIGGER);
364 static void server_cb(struct uloop_fd *fd, unsigned int events)
369 next = get_next_connection(fd->fd);
373 static struct uloop_fd server_fd = {
377 static int usage(const char *progname)
379 fprintf(stderr, "Usage: %s [<options>]\n"
381 " -A <path>: Set the path to ACL files\n"
382 " -s <socket>: Set the unix domain socket to listen on\n"
387 static void sighup_handler(int sig)
392 int main(int argc, char **argv)
394 const char *ubus_socket = UBUS_UNIX_SOCKET;
398 signal(SIGPIPE, SIG_IGN);
399 signal(SIGHUP, sighup_handler);
401 openlog("ubusd", LOG_PID, LOG_DAEMON);
404 while ((ch = getopt(argc, argv, "A:s:")) != -1) {
407 ubus_socket = optarg;
410 ubusd_acl_dir = optarg;
413 return usage(argv[0]);
419 server_fd.fd = usock(USOCK_UNIX | USOCK_SERVER | USOCK_NONBLOCK, ubus_socket, NULL);
420 if (server_fd.fd < 0) {
425 uloop_fd_add(&server_fd, ULOOP_READ | ULOOP_EDGE_TRIGGER);